4.3 Article

Si-based infrared optical filters

Journal

OPTICAL ENGINEERING
Volume 54, Issue 12, Pages -

Publisher

SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.OE.54.12.127103

Keywords

infrared filters; variable density filters; black-Si; nanotextured surfaces; cold materials

Categories

Funding

  1. JSPS KAKENHI [25420752]
  2. Australian Research Council [DP130101205]
  3. Grants-in-Aid for Scientific Research [25420752] Funding Source: KAKEN

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Pyramidal silicon nanospikes, termed black-Si (b-Si), with controlled height of 0.2 to 1 mu m, were fabricated by plasma etching over 3-in wafers and were shown to act as variable density filters in a wide range of the IR spectrum 2.5 to 20 mu m, with transmission and its spectral gradient dependent on the height of the spikes. Such variable density IR filters can be utilized for imaging and monitoring applications. Narrow IR notch filters were realized with gold mesh arrays on Si wafers prospective for applications in surface-enhanced IR absorption sensing and cold materials for heat radiation into atmospheric IR transmission window. Both types of filters for IR: spectrally variable and notch are made by simple fabrication methods. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)

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